first upload all files

Modules/FlashSale/Database/Migrations/2020_01_15_000346259038_create_flash_sales_table.php

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+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class CreateFlashSalesTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('flash_sales', function (Blueprint $table) {
+            $table->increments('id');
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('flash_sales');
+    }
+}

Modules/FlashSale/Database/Migrations/2020_01_15_000346259349_create_flash_sale_translations_table.php

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+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class CreateFlashSaleTranslationsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('flash_sale_translations', function (Blueprint $table) {
+            $table->increments('id');
+            $table->integer('flash_sale_id')->unsigned();
+            $table->string('locale');
+            $table->string('campaign_name');
+
+            $table->unique(['flash_sale_id', 'locale']);
+            $table->foreign('flash_sale_id')->references('id')->on('flash_sales')->onDelete('cascade');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('flash_sale_translations');
+    }
+}

Modules/FlashSale/Database/Migrations/2020_01_23_011234_create_flash_sale_products_table.php

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+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class CreateFlashSaleProductsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('flash_sale_products', function (Blueprint $table) {
+            $table->increments('id');
+            $table->integer('flash_sale_id')->unsigned();
+            $table->integer('product_id')->unsigned();
+            $table->date('end_date');
+            $table->decimal('price', 18, 4)->unsigned();
+            $table->integer('qty');
+            $table->integer('position');
+
+            $table->foreign('flash_sale_id')->references('id')->on('flash_sales')->onDelete('cascade');
+            $table->foreign('product_id')->references('id')->on('products')->onDelete('cascade');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('flash_sale_products');
+    }
+}

Modules/FlashSale/Database/Migrations/2020_01_30_015722_create_flash_sale_product_orders_table.php

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+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class CreateFlashSaleProductOrdersTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('flash_sale_product_orders', function (Blueprint $table) {
+            $table->integer('flash_sale_product_id')->unsigned();
+            $table->integer('order_id')->unsigned();
+            $table->integer('qty');
+
+            $table->primary(['flash_sale_product_id', 'order_id']);
+            $table->foreign('flash_sale_product_id')->references('id')->on('flash_sale_products')->onDelete('cascade');
+            $table->foreign('order_id')->references('id')->on('orders')->onDelete('cascade');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('flash_sale_product_orders');
+    }
+}

Modules/FlashSale/Database/Seeders/FlashSaleDatabaseSeeder.php

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+<?php
+
+namespace Modules\FlashSale\Database\Seeders;
+
+use Illuminate\Database\Seeder;
+use Illuminate\Database\Eloquent\Model;
+
+class FlashSaleDatabaseSeeder extends Seeder
+{
+    /**
+     * Run the database seeds.
+     *
+     * @return void
+     */
+    public function run()
+    {
+        Model::unguard();
+
+        // $this->call("OthersTableSeeder");
+    }
+}